vs. 135-ft. dipole
In the frequency sweeps below, both antennas are constructed of bare
copper wire (18 AWG) and supported at 60' AGL.
You'll note comparable SWR
data across the entire HF spectrum (160-6m).
4NEC2 analysis for 450Ω ladder line feeder.
here our Web
site, our multi-year design goal
was to emulate the operation and performance of a full-size 135-ft.
dipole in a much smaller footprint. Over 10,000 4NEC2 computer
simulations, and many real-world constructions and tests, led to the
HybridDX design that closely mirrors the characteristics (including
SWR profile) of a 135-ft. dipole fed with ladder line -- but in just 79
feet of horizontal space. Its various constructions and configurations
are patented, with additional configurations patent pending.
Additional information regarding SWR:
Both a 135-ft. dipole and the HybridDX antenna are non-resonant,
multi-band antennas. Both antennas inherently have SWR measurements that will
vary from band to band, as well as by the real-world situations and
environments they are installed in. The varying SWR is integral to the
nature of these antennas. Both a 135-ft. dipole and the HybridDX
antenna maintain an SWR profile within a targeted range, allowing them
to perform across a wide envelope of the HF spectrum.
The above SWR frequency sweeps, as plotted by 4NEC2, displays the
engineered similarities. Across the HF spectrum, even with the full-size
135-ft. antenna, SWR readings between 2
- 9 (or greater) are common, as
the plots show. However, the ladder line feeder helps maintain
overall efficiency. Even in a high-SWR circumstance -- say 9:1 SWR -- both antenna designs will have minimal power loss.
In this example, using 75 feet of ladder line (as is supplied with the HybridDX
antenna), the "SWR loss would be truly tiny: only about a tenth of a dB (0.139
dB). And, as we hams know, it takes 6dB of change on the transmitter side to register a single S unit on the receiving side.
We hope you find the
information helpful. 73.
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Quicksilver Radio Products. (203) 440-4973.
Patented. Multiple patents issued and multiple additional
Quicksilver Radio Products is the exclusive licensee of the patented technology.
"HybridDX", "Antenna Clip-Up", and "Modern era of ham radio"
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